记一次莫名其妙的 CPU 100% Bug 排查
问题描述
系统环境
CentOS 7.5.1804
tracker-extract CPU 占用率 100%
用htop查看系统负载，发现其中一个 CPU 长时间处于100%状态，排查后发现罪魁祸首就是/usr/libexec/tracker-extract这个进程。
直接kill或kill -9后，进程tracker-extract会自动重启，并再次达到CPU 100%。
> yum info tracker
Installed Packages
Name : tracker
Arch : x86_64
Version : 1.10.5
Release : 6.el7
Size : 5.6 M
Repo : installed
From repo : anaconda
Summary : Desktop-neutral search tool and indexer
URL : https://wiki.gnome.org/Projects/Tracker
License : GPLv2+
Description : Tracker is a powerful desktop-neutral first class object database,
: tag/metadata database, search tool and indexer.
:
: It consists of a common object database that allows entities to have an
: almost infinite number of properties, metadata (both embedded/harvested as
: well as user definable), a comprehensive database of keywords/tags and
: links to other entities.
:
: It provides additional features for file based objects including context
: linking and audit trails for a file object.
:
: It has the ability to index, store, harvest metadata. retrieve and search
: all types of files and other first class objects
tracker-extract属于tracker包，主要用于桌面索引，下面介绍几种解决办法。
1. 卸载 tracker（不推荐）
最直接的办法，卸载tracker包，不过会同时卸载nautilus、gnome-classic-session等相关依赖包，不推荐这种方法。
> yum info tracker
Installed Packages
Name : tracker
Arch : x86_64
Version : 1.10.5
Release : 6.el7
Size : 5.6 M
Repo : installed
From repo : anaconda
Summary : Desktop-neutral search tool and indexer
URL : https://wiki.gnome.org/Projects/Tracker
License : GPLv2+
Description : Tracker is a powerful desktop-neutral first class object database,
: tag/metadata database, search tool and indexer.
:
: It consists of a common object database that allows entities to have an
: almost infinite number of properties, metadata (both embedded/harvested as
: well as user definable), a comprehensive database of keywords/tags and
: links to other entities.
:
: It provides additional features for file based objects including context
: linking and audit trails for a file object.
:
: It has the ability to index, store, harvest metadata. retrieve and search
: all types of files and other first class objects
> yum remove tracker
Dependencies Resolved
=================================================================================
Package Arch Version Repository Size
=================================================================================
Removing:
tracker x86_64 1.10.5-6.el7 @anaconda 5.6 M
Removing for dependencies:
brasero x86_64 3.12.1-2.el7 @anaconda 11 M
brasero-nautilus x86_64 3.12.1-2.el7 @anaconda 47 k
evince-nautilus x86_64 3.22.1-7.el7 @anaconda 19 k
gnome-boxes x86_64 3.22.4-4.el7 @anaconda 5.0 M
gnome-classic-session noarch 3.26.2-3.el7 @anaconda 199 k
grilo-plugins x86_64 0.3.4-3.el7 @anaconda 2.1 M
nautilus x86_64 3.22.3-5.el7 @anaconda 15 M
totem x86_64 1:3.22.1-1.el7 @anaconda 6.3 M
totem-nautilus x86_64 1:3.22.1-1.el7 @anaconda 36 k
tracker-preferences x86_64 1.10.5-6.el7 @base 248 k
Transaction Summary
=================================================================================
Remove 1 Package (+10 Dependent packages)
Installed size: 45 M
Is this ok [y/N]: n
2. tracker daemon -k（暂时性）
暂时性的方法，调用tracker daemon -k杀死所有tracker相关进程：
> tracker
usage: tracker [--version] [--help]
<command> [<args>]
Available tracker commands are:
daemon Start, stop, pause and list processes responsible for indexing content
extract Extract information from a file
info Show information known about local files or items indexed
index Backup, restore, import and (re)index by MIME type or file name
reset Reset or remove index and revert configurations to defaults
search Search for content indexed or show content by type
sparql Query and update the index using SPARQL or search, list and tree the ontology
sql Query the database at the lowest level using SQL
status Show the indexing progress, content statistics and index state
tag Create, list or delete tags for indexed content
See 'tracker help <command>' to read about a specific subcommand.
> tracker daemon -k all
Found 10 PIDs…
Killed process 2390 - 'tracker-miner-user-guides'
Killed process 2395 - 'tracker-store'
Killed process 2656 - 'tracker-miner-apps'
Killed process 2705 - 'tracker-miner-fs'
Killed process 2952 - 'tracker-miner-user-guides'
Killed process 2962 - 'tracker-extract'
Killed process 2963 - 'tracker-miner-apps'
Killed process 2964 - 'tracker-miner-fs'
Killed process 2987 - 'tracker-store'
Killed process 13666 - 'tracker-extract'
可通过
tracker daemon -s重新启动tracker相关进程
3. 禁用 tracker 的 autostart
在/etc/xdg/autostart/tracker*.desktop文件的末尾添加以下内容：
Hidden=true
注销后重新登录生效。
4. 安装 tracker-preferences
> yum info tracker-preferences
Available Packages
Name : tracker-preferences
Arch : x86_64
Version : 1.10.5
Release : 6.el7
Size : 58 k
Repo : base/7/x86_64
Summary : Tracker preferences
URL : https://wiki.gnome.org/Projects/Tracker
License : GPLv2+
Description : Graphical frontend to tracker configuration.
> yum install tracker-preferences
tracker-preferences
打勾的选项全部取消，注销后重新登录生效。
参考文章
- tracker-extract high cpu usage | StackExchange
- tracker-extract process with 100% cpu usage | CentOS
- [Solved] How to disable tracker-store processes that eat 100% CPU | openSUSE Forum
- Ubuntu Gnome 14.04 tracker-extract 占用内存太高 | CSDN
- 解决 Linux 中 tracker 大量占用 CPU 的问题 | Linux 公社
- Ubuntu 16.04 莫名其妙占用 CPU 的 tracker | Paulus.Chen
